Yup just picked up a ton of these! not sure if the 840 pro will be as reliable. As long as you OP 20% these drives won't do the 10-20 second GC stutter. (no reads/writes during GC when pushed too hard and too hot).
Has anyone taken these apart to cool them down better? seems like they draw a ton of power and when they heat up too much they start to throttle themselves causing GC stutters. Causes all heck for some raid controllers.
I am using 48 Samsung 830 128GB without any OP in my workstation and I would rate the load as I/O heavy. With complete writes (meaning a full disk), immediately deleting most of the files, rewriting again and again without any pause in between. I've had a few days where the avg. I/O rate stayed above 10 GByte/sec uninterrupted for the whole day - producing close to a petabyte transfers.
Have yet to see GC stutter with the samsung drives.